Adjustable center for tailstocks



July 1, 1941. T w T 2,247,721

' ADJUSTABLE CENTER FOR TAILSTOCKS Filed Aug. 2, 1940 2 A2: 1

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477E. W970i IN VEN TOR.

BY /I 1.

- ATTORNEYS.

mama July 1,1941

UNITED STATES PAT ENT OFFICE ADJUSTABLE mi i t n Tms'rocxs Thomas Eugene Wright, Jersey City, N. 1. Application August 2, 1940, Serial No. 349,939 4 Claims. (01. 82-33) This invention relates to an adjustable center for the tail-stocks of lathes, one of the objects being to provide a simple but eflicient means whereby an accurate adjustment of the center can be eflected in anv direction.

A still further object is to provide a tail-stock wherein adjustment of the center carried thereby can be done quickly and accurately, means being employed for indicating minute adjustment.

With the foregoing and other objects in view which will appear as the description proceeds, the invention consists of certain novel details of construction and combinations of parts hereinafter more fully described and pointed out in the claims, it being understood that changes may be made in the construction and arrangement of parts without departing from the spirit of the invention as claimed.

In the :companying drawing the preferred form of the invention has been shown.

In said drawing Figure 1 is an elevation of the device.

Figure 2 is a longitudinal section therethrough, the center being shown in elevation.

Figure 3 is an end elevation.

Referring to the figures by characters of reference, I designates a sleeve of standard taper adapted to be held within the tail-stock of a lathe. This sleeve is provided at its large or open end with an annular flange 2 while its small or closed end carries a holding screw 3 or the like adapted to be locked in place by a nut I and provided at that end within the sleeve with a point 5.

The center has been indicated at 6 and has a long tapered portion 1 recessed at its small end as shown at I to receive the point 5 while its other or large end has a short taper leading to a point 8. That portion of the center surrounded by the flange 2 is provided with regularly spaced recesses Ill each of which provides a flat bearing for the inner end of an adjusting screw ll'. Preferably four of these'adjusting screws are provided, these screws being extended through the flanged end of the sleeve and being provided with large flat heads I! on each of which is arranged an annular series of graduations designated by suitable numerals for indicating minute fractional portions of an inch. These graduations, shown at ii, are adapted to be read in connection with one or more afflxed marks It on the flange 2 and which are designated by the character 0." The screws are so proportioned and assembled with the center 6 that when the the usual means. Furthermore the fact that the.

zero graduation ll registers with one of the marks It, the center will be held in position coaxial with the sleeve I. By unscrewing one of the 'adjusting screws H a fraction of an inch mark ll. As the opposed recesses II are flat and parallel with each other, it will be apparent that when the center is adjusted in one direction and held by two of the screws. it will slide between the remaining screws. Obviously by providing the screws as indicated the adjustment of the center can be eflected upwardly or downwardly or horizontally in order to bring the point t to the desired position relative to the head-stock of the lathes.

By providing a center such as described the adjustment of its point can be efiected quickly and accurately and in a manner insuring greater satisfaction than where the point is adjusted by point can be adjusted upwardly and downwardly by the screws as well as forwardly and backwardly gives the center an advantage over those ordinarily employed. The micrometer adjustment possible, renders the device especially desirable for use in connection with work requiring minute adjustments.

What is claimed is:

1. A center for the tail-stock of a lathe, including a tapered sleeve open at one end, separate pairs of opposed adjusting screws mounted in the sleeve adjacent to its open end and radially disposed relative to the axial center of the sleeve, a center within and spaced from the sleeve and having a point projecting from the sleeve, means for supporting one end of the center in the sleeve, there being separate pairs of opposed flat bearing surfaces on the center positioned for engagement by the respective screws.

2. A center for the tail-stock of a lathe, including a sleeve closed at one end and open at its other end, radially disposed adjusting screws extending into the sleeve at its open end and arranged in pairs, the screws of each pair being alined, a supporting screw extending into the closed end of the sleeve, and a center bearing at one end of said supporting screw and adjacent -to its other end against the inner ends of the adjusting screws.

3. A center for the tail-stock of a lathe,'in-.

eluding a sleeve closed at one end and open at its other end, radially disposed adjusting screws extending into the sleeve at its open end and arranged in pairs, the screws of each pair being aimed, a supporting screw extending into the closed end of the sleeve, and a center bearing at one end on said supporting screw and adjacent to its other end against the inner ends. of the adjusting screws, said center being provided with flat bearing surfaces disposed in pairs, the surfaces of each pair being oppositely arranged and each surface being positioned for sliding contact 10 its other end, radially disposed adjusting screws 15 extending into the sleeve at'its open end and arranged in pairs, the screws or each pair being alined, a supportingscrew extending into the closed end of the sleeve, and a center hearing at one end on said supporting screw and adjacent to its other end against the inner ends of the adjusting screws, said center being provided with flat bearing surfaces disposed inwpairs, the surfaces of each pair being oppositely arranged and each surface being positioned for sliding contact with one oi the screws and for receiving thrust from said screw, and cooperating meanson the sleeve and each screw for indicating the extent of each adjustment of the screw.

THOMAS EUGENE WRIGHT. 

